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Because that's not cool.
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Because its information overload (name even 50 albums and the songs on them. Humans dont need thousands of albums. Our brains are not meant for this much information. You can't appreciate 1000 albums)
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It has no resale value. And if that HDD dies or you die and your family doesn't know how to use it or how to decrypt it, its useless.
I don't consider HDDs physical media per se. No one is handing down hard drives or selling them at yard sales. I can play my great grandpas 1890 shellac records. Think a hard drive will be able to do that? Hell no.